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Define power of a refracting surface. (D...

Define power of a refracting surface. (Define the power of a lens).

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The power of a lens is definded as the tangent of the angle by which it converges or diverges a beam of light falling at one metre distant from the optical centre.
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SUBHASH PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-TWO MARKS QUESTIONS WITH ANSWERS
  1. What is an optical fibre? Name the principle on which it works.

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  2. Distinguish between a pure and an impure spectrum.

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  3. Define power of a refracting surface. (Define the power of a lens).

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  4. Draw a neat diagram to show dispersion of light in a prism.

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  5. Why vaccum is a non-dispersive medium?

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  6. Can dispersive power of a prism be negative? Give reason for your answ...

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  7. Is the dispersive power independent on the angle of the prism? Give re...

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  8. Draw a graph of angle of deviation versus the angle of incidence in a ...

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  9. Define dispersive power of the material of a prism. How can it be meas...

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  10. Draw a neat labeled diagram of a prism.

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  11. A ray of light incident at 60^(@) on a prism undergoes a deviation of ...

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  12. Draw a neat labeled diagram to obtain an inverted image in the case of...

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  13. Draw a neat labeled diagram to show the turning of light rays through ...

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  14. Draw a neat labeled diagram to show the reflected rays turned through ...

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  15. Write the expression for R.I. of the material of the prism for symmetr...

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  16. Write the expression for the power of a lens in terms of powers of its...

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  17. Write the formula for the equivalent focal length of two thin lenses s...

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  18. How can the power of the combination expressed, if two lenses are equi...

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  19. Two lenses having focal lengths +0.20 m and -0.30 m are separated by a...

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  20. An extended object is placed at the principal focus of a lens. Where w...

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